FILE - Houston Police Chief Art Acevedo, center, and Houston Mayor Sylvester Turner, far right, join demonstrators during a "March for Our Lives" protest for gun legislation and school safety Saturday, March 24, 2018, in Houston. The National Rifle Association is going ahead with its annual meeting in Houston just days after the shooting massacre at a Texas elementary school that left 19 children and 2 teachers dead. With protests planned outside, former President Donald Trump and other leading GOP figures, including South Dakota Gov. Kristi Noem, will address attendees. (AP Photo/David J. Phillip, File)